1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* Copyright (c) 2010-2012, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "main.h"
#include "proxy.h"
static void rspamd_proxy_backend_handler (gint fd, gshort what, gpointer data);
static void rspamd_proxy_client_handler (gint fd, gshort what, gpointer data);
static inline GQuark
proxy_error_quark (void)
{
return g_quark_from_static_string ("proxy-error");
}
void
rspamd_proxy_close (rspamd_proxy_t *proxy)
{
if (!proxy->closed) {
close (proxy->cfd);
close (proxy->bfd);
event_del (&proxy->client_ev);
event_del (&proxy->backend_ev);
proxy->closed = TRUE;
}
}
static void
rspamd_proxy_client_handler (gint fd, gshort what, gpointer data)
{
rspamd_proxy_t *proxy = data;
gint r;
GError *err = NULL;
if (what == EV_READ) {
/* Got data from client */
event_del (&proxy->client_ev);
r = read (proxy->cfd, proxy->buf, proxy->bufsize);
if (r > 0) {
/* Write this buffer to backend */
proxy->read_len = r;
proxy->buf_offset = 0;
event_del (&proxy->backend_ev);
event_set (&proxy->backend_ev, proxy->bfd, EV_WRITE, rspamd_proxy_backend_handler, proxy);
event_add (&proxy->backend_ev, proxy->tv);
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err, proxy_error_quark(), r, "Client read error: %s", strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else if (what == EV_WRITE) {
/* Can write to client */
r = write (proxy->cfd, proxy->buf + proxy->buf_offset, proxy->read_len - proxy->buf_offset);
if (r > 0) {
/* We wrote something */
proxy->buf_offset +=r;
if (proxy->buf_offset == proxy->read_len) {
/* We wrote everything */
event_del (&proxy->client_ev);
event_set (&proxy->client_ev, proxy->cfd, EV_READ, rspamd_proxy_client_handler, proxy);
event_add (&proxy->client_ev, proxy->tv);
event_del (&proxy->backend_ev);
event_set (&proxy->backend_ev, proxy->bfd, EV_READ, rspamd_proxy_backend_handler, proxy);
event_add (&proxy->backend_ev, proxy->tv);
}
else {
/* Plan another write event */
event_add (&proxy->backend_ev, proxy->tv);
}
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err, proxy_error_quark(), r, "Client write error: %s", strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else {
/* Got timeout */
g_set_error (&err, proxy_error_quark(), ETIMEDOUT, "Client timeout");
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
}
static void
rspamd_proxy_backend_handler (gint fd, gshort what, gpointer data)
{
rspamd_proxy_t *proxy = data;
gint r;
GError *err = NULL;
if (what == EV_READ) {
/* Got data from backend */
event_del (&proxy->backend_ev);
r = read (proxy->bfd, proxy->buf, proxy->bufsize);
if (r > 0) {
/* Write this buffer to client */
proxy->read_len = r;
proxy->buf_offset = 0;
event_del (&proxy->client_ev);
event_set (&proxy->client_ev, proxy->bfd, EV_WRITE, rspamd_proxy_client_handler, proxy);
event_add (&proxy->client_ev, proxy->tv);
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err, proxy_error_quark(), r, "Backend read error: %s", strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else if (what == EV_WRITE) {
/* Can write to backend */
r = write (proxy->bfd, proxy->buf + proxy->buf_offset, proxy->read_len - proxy->buf_offset);
if (r > 0) {
/* We wrote something */
proxy->buf_offset +=r;
if (proxy->buf_offset == proxy->read_len) {
/* We wrote everything */
event_del (&proxy->backend_ev);
event_set (&proxy->backend_ev, proxy->bfd, EV_READ, rspamd_proxy_backend_handler, proxy);
event_add (&proxy->backend_ev, proxy->tv);
event_del (&proxy->client_ev);
event_set (&proxy->client_ev, proxy->cfd, EV_READ, rspamd_proxy_client_handler, proxy);
event_add (&proxy->client_ev, proxy->tv);
}
else {
/* Plan another write event */
event_add (&proxy->backend_ev, proxy->tv);
}
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err, proxy_error_quark(), r, "Backend write error: %s", strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else {
/* Got timeout */
g_set_error (&err, proxy_error_quark(), ETIMEDOUT, "Client timeout");
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
}
/**
* Create new proxy between cfd and bfd
* @param cfd client's socket
* @param bfd backend's socket
* @param bufsize size of exchange buffer
* @param err_cb callback for erorrs or completing
* @param ud user data for callback
* @return new proxy object
*/
rspamd_proxy_t*
rspamd_create_proxy (gint cfd, gint bfd, memory_pool_t *pool, struct event_base *base,
gsize bufsize, struct timeval *tv, dispatcher_err_callback_t err_cb, gpointer ud)
{
rspamd_proxy_t *new;
new = memory_pool_alloc0 (pool, sizeof (rspamd_proxy_t));
new->cfd = dup (cfd);
new->bfd = dup (bfd);
new->pool = pool;
new->base = base;
new->bufsize = bufsize;
new->buf = memory_pool_alloc (pool, bufsize);
new->err_cb = err_cb;
new->user_data = ud;
new->tv = tv;
/* Set client's and backend's interfaces to read events */
event_set (&new->client_ev, new->cfd, EV_READ, rspamd_proxy_client_handler, new);
event_base_set (new->base, &new->client_ev);
event_add (&new->client_ev, new->tv);
event_set (&new->backend_ev, new->bfd, EV_READ, rspamd_proxy_backend_handler, new);
event_base_set (new->base, &new->backend_ev);
event_add (&new->backend_ev, new->tv);
return new;
}
|
